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All you need to know about covers

The winter cover is your pool's coat of arms during the long winter months. It covers the entire surface of the pool and is attached to the deck (using pegs, telescopic anchors, springs or bungee cords) to ensure perfect tension. The use of a liner protects the water and the lining of your pool by preventing the accumulation of leaves at the bottom of the pool.

Winter covers can be adapted to both in-ground and semi-in-ground pools or above-ground.

The winter cover is a safety equipment for your swimming pool, and thus allows to avoid risks and falls. DEL offers a complete range of covers that comply with the NF P90-308 french standard relating to the law on swimming pool safety.

As well as being an effective protection during the winter period, the winter cover also makes it easier to put the pool back into use when the weather is fine, as your pool does not have to be drained or the water level reduced.

Don't hesitate to ask a professional to install and maintain your winter cover to withstand the seasonal weather.

How to choose a winter cover?

There are two types of winter covers:

  • Opaque winter covers keep the pool water dark, preventing photosynthesis and algae formation during the winter.
  • Lightweight and easy to install, debris winter covers are particularly recommended for large pools. They filter out dirt and reduce water maintenance and cleaning.

DEL also recommends the installation of a net cover on pools equipped with a automatic slatted cover, thus limiting the formation of stains on the blades or Slats due to stagnant leaves during the winter.

What is a bubble cover?

A isothermal cover is made up of thousands of air bubbles, more or less opaque, which float on the water (water-side bubbles). It allows you to cover your pool on a daily basis from the beginning of spring in order to avoid water evaporation and to maintain the temperature of your pool, but also to possibly reinforce the heating effects of the sun's rays!

Lightweight, easy to use and effective, it will significantly reduce the heat loss from your pond (reduction of evaporation by about 90% compared to an uncovered pond, and loss of only 1 to 2° at night, compared to 4 to 6° otherwise).

It will also largely protect against impurities (insects, plants), which will make your maintenance easier.

How to choose an isothermal cover?

Choose your Bubble cover according to the climate in your area. The warmer the weather, the more algae will grow in your pool water. You will need a highly opaque cover that fights algae growth.

On the contrary, a cover with a very good solar yield may be necessary to allow the water to gain a few degrees.

  Action on
water temperature
Action on
heat loss
Action on
ENERGYGUARD 2 ++ ++ +++
SOLGUARD +++ ++ -
EXTRASUN +++ ++ +
SUNDOWN +++ + +
MIDNIGHT ++ + +++
BLUE BLUE +++ ++ +
SILVER BLUE ++ ++ ++
BLUE BLUE ++ + +
ISODEL + ++++ +++

Isothermal covers are not standardised safety equipment. You must have additional equipment that meets the current standard.

Ask your swimming pool specialist for advice.

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